HH likes math very much. Today he found some numbers that are special. These special numbers are defined as "numbers that can be divisible by less than $3$ positive integers." Now HH wants to ask you how many special numbers there are in the interval $[L,R]$.

The first line contains two integers $L,R$ — the interval.$( 0 ≤ L ≤ R ≤10^5 )$

Output the number of special numbers in the interval $[L,R]$.

In the first case, only $3, 5$ in $3, 4, 5, 6$ are special numbers.
In the second case, $8$ is not special number.